Disconnect the battery. Remove the brake and clutch pedal pads, remove your floor covering, ( I'm assumming you have a partial wooden floor ) you'll see two screws that hold the dimmer switch loosen them, not all the way may short out on the frame. Pull out all the screws holding the wooden floor. Lift up the floor so you can get one hand under and remove the two screws completely. Now pull the floor out and you'll have the dimmer switch exposed.